Apparatus por deaeration op liquids



March 17. 1925, 1,529,884

s. H. HALL APPARATUS FOR DEAERATION OF LIQUIDS Filed April 4, 1924bubbles that it does not readily separate Patented Mar. I7, 1925.

UNITED vSTATES 1,529,884 T OFFICE.

PATEN SIE'IIIJIDE'NV E. HALL, 0F POUGHKEEPSIE, NEW YORK, ASSIGNOB, TOTHEDE LAVAL SEPA- BATOB COMPANY, 0F NEW YORK, N. Y., A CORPORATION- 0FNEW JERSEY.

APPARATUS FOR DEAERATION 0F LIQUIDS.

Application led April 4,

To allfwhomt may concern:

Be it known that I, SELDEN H I-IALL, acitizen of the United States,residing at Poughkeepsie, county of Dutchess, and State ot New York,have invented a new and 'useful Improvement in Apparatus for Deaerationof Liquids, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, whichform a part of this specification.

The object of my invention is the provision of simple and economicalmeans to remove from' liquids, air or other gases which may have beenentrained by agitation, atomization, or from any other cause.

I have 4observed that when liquids like milk, water or oils aredischarged from a centrifugal machine, they are broken up into a finespray and entrain a considerable uantity of air in such very finelydivided from the liquid. I have even proven the presence of a largequantity of air in oil that has stood .quiescent for more than half anhour and I have seen milk froth remain in a tank for several hours.

I have devised novel and eifective apparaf tus wherein gassy liquid maybe subjected to a partial vacuum, which will cause such expansion of theair bubbles that they`will expand, break and escape, leaving a gas-freeliquid. The invention is adapted to the removal of gas from foamyliquids as well as from liquids which, while not substantially foamy,have small bubbles of air entrained therein which are more or `lessuniformly distributed throughout the bulk of the liquid. It will beunderstood that the word gas is used in its physical sense to includeair or any other gaseous fluid. It will also be understood that in usingthe term degasifying I mean to include, as well as defoaming, thesubstantial removal of gas 1n whatever form it may be entraincd.

The: ldrawings show two apparati embodyi-gmy invention.

Fig. 1 is a diagram, in vertical section, of

one such apparatus, and Fig. 2 is a siimlar view of another suchapparatus. v a is a centrifugal machine which discharges into a tank bhaving an outlet pipe c, the inlets d to which may be closed by a valvee operated by a. ioat f. The pipe c leads to the top of a`- chamber gprovided with shallow pans h, through which the liq- 1924. Serial No.704,280.

uid ilows consecutively, thus being spread 4 lchamber g a pipe Ic leadsto a liquid pump p.

The pipe extends up inside the chamber, has its upper end closed, andhas ports m 1n its sides that are closed by a valve n when the liquid inthe chamber allows the oat o to drop.

When in operation the areated liquid from the centrifugal machine aenters the tank b, where the large bubbles rise to the top. The liquidfrom the bottom, containin onl smaller bubbles, flows through the 1n etsand pipe c to the chamber g, where it .is spread out in thin layers onthe pans h, giving anopportunity for rapid separation of thebubblesgreatly enlarged by the reduction of pressure caused by thevacuum pump j. With a vacuum of 15" of mercury, the bubbles are abouttwice normal volume; with 22 vacuum nearly 4 times; with 26" nearly 8ytimes; and-with 28 nearly 16 times normal volume. The above data arepredicated on a 30 barometer. The liquid,'freed from air or gas, fallsto the bottom of the chamber, raises the float o and valve n, openingthe ports m, and then flows through these ports and the pipe lc to thepump p, which forces it to any desired location.

In Fig. 2, which shows another form of apparatus for carrying out myinvention, the tank 1', correspondin in function to the tank g of Fig.1, is p aced at an eleva.- tion, and instead of having in it a number ofshallow trays, the tank itself is made long ang wide so as to obtain,ari-equivalent area an whic corresponds to the pipe lc of Fig. 1, isalso made so long that, when it is filled with liquid, the weight of theliquid will overcome the atmospheric pressure outside and cause a flowfrom the tank r. A non-return valve is provided at 't to prevent theentrance of air when the apparatus is being started.

` The operation of the two apparati is the same except that no pump isneeded to draw the liquid from the tank (r) in the apparatusshown inFig. 2.

`In the claims, where reference is made to a high vacuum, yI meantoinclude a vacuum of twenty inches of mercury. or higher.

provided with a baffle u. The pipe s,

Havin now fully described my invention, what I c aim and desire toprotect by Letters Patent is:

1. Apparatus for degasifying liquids comprising a. preliminary tankprovided with an inlet to receive the liquid to be degassed and anoutlet for the esca e of such liquid, means adapted to close sai outletbefore the level of liquid in said tank falls to the level of saidoutlet, a second .treatin pipe connecting said outlet with the secondchamber, means to maintain a high vacuum in the second chamber, meansrovidin a. passage for the' withdrawal of egassed fiquid from the secondtank, and means preventin the escapeof gases with the withdrawn iquid.

2. Apparatus for degasiyingli nids comprising, in combination, two tans, pipes chamber, a

extending upward into the respective tanks 20 and adapted to communicaterespectively with the same below the liquid leve s therein,float-controlled valves, one for each tank alxlapted to shut oil'communication between t e when the leve of the liquid drops below aredetermined height, the pipe communicatmg with the first tankcommunicating also with the upper portion of the second tank,

ody of li uid in each tank and said pipe 2 means within the second tankand above its 30 bottom portion adapted to spread the liquid in aArelatively thin layer over la. relatively large area, and a vacuum pumpcommunicatwith the second tank.

n testimony of which invention, VI havey 35 hereunto set m hand, atPoughkeepsie, on this 31st day o March, 1924.'

SELDEN H. HALL.

